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Voice call feature is now available on whatsapp for all users. Here is how you can activate it.Step 1: Download Whatsapp app from here or update Whatsapp to latest version.Step 2: Now ask your friend to call you who has already activated the calling feature.Step 3: Pickup the call and talk for minimum 10 seconds.Now Whatsapp calling feature is activated on your phone.You are now able to see a call tab and call icons on your phone.